Review on Improved Joystick Thumb Stick Key Caps for enhanced gaming experience on Sony PlayStation: Hapurs Anti-skip Silicone Replacement Joy Stick Controller Shell Cover Protector for PlayStation 3, PS4, and Xbox 360 by Veronica Fermin

It should be clear in the description that this is for PS4 controller, not for XBOX. If you put them on an Xbox controller, they will fall off. I'm pretty happy with them on my PS4 controllers considering how much they cost. With the left stick in the high position, there is a noticeable improvement in aiming when playing FPS games. I've never used KontrolFreeks, don't know how that relates to this. But a pair of KontrolFreeks costs twice as much.